ASE G1 Auto Maintenance and Light RepairEngine SystemsEasy
A technician is diagnosing a vehicle that exhibits a strong odor of gasoline, particularly after the engine has been running. Upon inspection, the technician notices a wet spot on the ground directly below the fuel tank. Which of the following is the most likely cause?
- AA faulty oxygen sensor
- BA clogged fuel filter
- CAn inoperative fuel gauge sender
- DA leaking fuel line or fuel tank
Show answer & explanationAnswer & explanation
Correct answer: D. A leaking fuel line or fuel tank
A strong gasoline odor and a wet spot under the fuel tank are direct indicators of a leak in the fuel delivery system, most commonly a fuel line or the tank itself.
Why the other options are wrong
- A. A faulty oxygen sensor affects fuel-air mixture and emissions, not external fuel leaks.
- B. A clogged fuel filter would typically cause engine performance issues, not an external fuel leak.
- C. An inoperative fuel gauge sender would affect the fuel level display, not cause a gasoline leak.
Fuel System Leak Symptoms
Symptoms of a fuel system leak include a strong gasoline odor, visible fuel drips or puddles, and potentially a decrease in fuel economy.
- Strong gasoline smell is a primary indicator.
- Visible fuel on the ground confirms a leak.
- Leaks can occur in lines, tank, or injectors.
Memory trick: Smell Gas, See Puddle, Find the Source.